Unless I am very much mistaken, this refers to "respot welding" or "finish-welding".

I have not yet managed to find any bilingual references that contain both the German and the English terms, other than

http://www.woxikon.de/eng/respot welding.php

http://www.woxikon.de/deutsch-englisch/respot welding.php

and similar, but will come back if I find any more.

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Note added at 49 mins (2012-06-28 08:56:53 GMT)
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Reference:

Punktschweißanlage ZB-Hinterbau

Manuelle Schweißanlage für Geo-Schweißpunkte und 2 automatische Ausschweißstationen mit Roboter für den Karosserierohbau. Die Bauteile werden von Hand gefügt. Das Punktschweißen der Geo-Schweißpunkte erfolgt mit Handpunktzangen. Automatisches Punktschweißen der Ausschweißpunkte mittels Robotern. Manueller Bauteiletransport mit selbstfahrenden Hebezeugen von Vorrichtung zu Vorrichtung.

http://www.strama-mps.de/de/produktportfolio/karosserieroh-b...

Spot welding plant assembly-rear end

Manual welding machine for geo-welding spots and 2 automatic respot welding stations with robot for body welding and assembly. Components are joined by hand. Spot welding of the geo-welding spots is made by means of manual welding guns. Automatic spot welding of the respot welds by means of robots. Manual transport of components from fixture to fixture using self-propelled hoisting devices.

http://www.strama-mps.de/en/product-portfolio/body-welding-a...

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Note added at 1 hr (2012-06-28 09:16:12 GMT)
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A brief description of what it means can be found in this (albeit somewhat old) document:

Robots in Industry

"Much of the work currently done by robots is in the area of respotting. This is a technique where an initially tacked together body is finally welded by a group of robots on the production line."

http://www.richandcath.co.uk/Electronics/robots.htm

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Note added at 1 hr (2012-06-28 09:17:26 GMT)
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As this example shows, "respot welding" is also referred to as "respotting".